Guest-Tunable Excited States in a Cyanide-Bridged Luminescent Coordination Polymer

Kenta Sasaki, Haruka Yoshino, Yuushi Shimoda, Masaki Saigo, Kiyoshi Miyata, Ken Onda, Kunihisa Sugimoto, Hitomi Yamate, Hiroki Miura, Benjamin Le Ouay, Ryo Ohtani, Masaaki Ohba

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The excited-state energy was tuned successfully by guest molecules in a cyanide-bridged luminescent coordination polymer (CP). Methanol or ethanol vapor reversibly and significantly changed the luminescent color of the CP between green and yellow (Δλem = 32 nm). These vapors did not significantly affect the environment around the luminophore in the ground state of the CP, whereas they modulated the excited states for the resulting bathochromic shift. The time-resolved photoluminescent spectra of the CP systems showed that solvent adsorption enhanced the energetic relaxation in the excited states. Furthermore, time-resolved infrared spectroscopy indicated that cyanide bridging in the CP became more flexible in the excited states than that in the ground state, highlighting the sensitivity of the excited states to external stimuli, such as the guest vapor. Overall, guest-tunable excited states will allow the more straightforward design of sensing materials by characterizing the transient excited states.

Original languageEnglish
Pages (from-to)6140-6146
Number of pages7
JournalInorganic chemistry
Issue number9
Publication statusPublished - May 3 2021

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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